Attribute Randomize node is missing 'add'
I'm guessing you're talking about the Default Cube tutorial. He's using the 2.93 alpha build and you're probably using 2.92. Anytime you're not getting the same options in a feature, it's probably because of a version mismatch. I did however find a workaround in 2.92; here's what worked for me after a little experimentation:

I imagine there's a better way to do this, but it's my first time using geometry nodes. I'd love to hear constructive criticism about this setup.